ConstructionStranded copper conductors. The insulation shall be either fire retardent ethylene propylene rubber (FREP) or fire retardant cross-linked Polyethylene (FRXLPe). Method 1 - Table K2 color coded, conductors cabled with suitable fillers as necessary, cable tape, CSPE jacket overall, surface printed.Standards1) Cables meet requirements of ICEA Pub. No. S-66-524, NEMA Pub. No.WC7, Cross-linked Polyethylene Insulated Wire and Cable.2) Cables pass IEEE-383 ribbon burner flame test.3) Individual conductors pass UL 44 and the VW-1 vertical flame test.4) TC Type Tray Cable per Article 340 of the NEC.